Machine element



J. JENSEN.

I MACHINE ELEMENT. APPLICATION FILED OCT. 4, 1918.

1,389,565 2 SHEETSSHEETI Aug- 30, 1921. 2 SHEETS-SHEET 2.

1720677127" \7U/ J/ZJf/Z ,J/C f" mix v":

Patented UNITED STATE'LS'T "AT Nr OFFICE.

Jenn JENSEN, or ROCKFORD, ILLINOIS, ASSIGfibRfiiOWHITNEY METAL ,PANY, 0F ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

MACHINE Application filed October 4, 1918.

Be it .knownthat I, JOHN JENSEN, a citizen of the United States, residing at' Rockford, in the county of lVinnebag'o and State 01 Illinois, have invented certain new and useful Improvements in -Machine Elements, of which the following is a. specification.

This invention relates to anti-friction screw gearingadapted for heavy duty, as in the shearing and punching of metal sheets and bars.

In Patent N 0. 975,591, granted November 15, 1910, William A. Whitney, is shown a punch'comprising a bushing, a spindle extending through the bushing, the bushing and the spindle being'helically grooved, a

series of balls in said grooves, and a cylindrical spacer or retainer; for the balls, said retainer" being interposed between the bush ing and the spindle and provided with holes for receiving the balls. The grooves inthe bushing and the spindle are'longer than the series of balls, so that the series of balls rotates and moves longitudinally as a body or unit. I Among the many uses of punches and shears of the type-shown in said Whitney patent is the shearing and punching of metal in connection with. the erection of buildings. When employed in and upon buildings under construction, the tools receive extremely :rough usage, and lubrication of the tools is very apt to be neglected.

The retainer being; necessarily formed oi thin metal, it is subject to considerable wear under the most'favorable conditions, the ball-receiving holes 'i-n'ithe retainer becoming elongated as they wear; andthus I ailing in their function properly spaced apart. When lubrication is neglected, such wear-is greatlyincreased the holes :t'requently merging into one an- 7 other. If the retainer'isticks inthe screwthreaded bushing so as to become immov' able or diiiiculty movable, the tool must be repairedordiscarded. Even when the retainer is made of the least practicable thick- ;ness, vit nevertheless serves to space the spindle and the screw-threaded bushing apart and thus diminishes the extent of bearing surface between the balls and said bushing and spindle. Y

The primary object of this invention, therefore, is to produce a mechanism of the general type shown in said Whitney patent,

Specification f Letters lateiit;

sheared by pivotally of keeping the balls T TOOL can;

PatenteaAug. 3o,'= 1e21 Serial No. 256,783.

which shall be free from the Objectionable l featuresincident to the use of a, retainer or spacer.

, In the accompanying. drawings, Figure 1 is a side elevation of a shear embodying the featuresof my invention. Fig. 2 is a fragmental horizontal sectional view taken on line 2-2 of Fig. 1.- Fig. 3is a vertical sectional view taken in the plane of line 3+3 of Fig. 1, but onv an" enlarged scale.

F ig. 4 is a fragmentary sectional view takenthrough the bearing bushing to show a section of scale. a

The embodiment herein shown of my invention comprises a generally circular body 1 having feet 2 by means .of which themachine may be other suitable support. Pivotally supported ,upon the body l-is a disk 3., The disk 3 is secured to the body. 1' by means of a central pivot 'bolt 4 having a nut 5 vupon its ends.

Thefbofdy 1' and the disk3 are provided with openings .6 through which a rod. or

bar may be passed, and adjacent said openings the 'body and .disk are provided with shear plates 6 shearing operation. These openings are of various sizesand shapes in order to receive bars and rods of various cross-sectional dimension and forms. Such rods or bars extending through the openings 6Q may be moving the disk 3 to move the opening therein out of register with the opening in the body 1. Preferably bearing members 7 are provided on the body 1130 hold the rods or bars .being'sheared in position during the shearing operation. hese members 7 are in the form-of plates or bars mounted at one end on the bolt 4 and at theiropposite ends. upon stud bolts "8 carried by the body 1. The bolt .4 is extended .to accommodate the members 7, and

. the bolts '8. carry spacing sleeves-'9 and nuts [the ball :groove on. an enlarged secured to the floor or any arranged to coact in the V bular member 18, through whichextends a spindle 19. The member 18 is provided with a bushing '20 having an internal spiral groove 2O extendingthroughout its length to allow the vertical movement of the spindie; The latter has an external spiral groove 19 of a length substantially equal to that of the groove 20. In the grooves 19 and 2O is a series of balls 22, and in the upper end of the member 18 is fixed an annular stop 23 having its under surface shaped to receive the uppermost balls of the series and thus limit the upward movement of the spindle when the lowermost ball isat the lower end of the groove 19 in the spindle (Fig.3). The groove 19 is semicircular or substantially so in cross-section] The major portion of the cross-section of the groove 20? also is formedon the arc' of a circle, but the sides oithe grooves flare (as indicated at w in Fig. 4) so thatpthe width of the' groove 20 is greater than the diameter of the balls.

The tubular member 18 is pivotally supported by the boss 17 through the medium of tubular head 24 and a pair of links 25, the links being pivoted as by means of pins 26fand bolts 27 to'the boss 17 and head 24, re spectively. The member 18 is rigidly secured at its lowerend'to the head as by means of a screw-thread connection therewith, and the opening in the boss, through which the member 18 -eitends,is enlarged to permit of a swinging movement of the member therein. If desired, a set screw 18 may be entered between themember 18 and bush-v ing 20 to lock thmagainst relative movement. 3 f

Upon its upper end thespindle comprises a cylindrical portion 28-a'nd a polygonal portion 29. The cylindrical portion is adapted to receive an actuating wheel 30 (Fig'. 1), while the polygonal portion is adapted to receive a hand lever 31 (Fig. i V On the disk 3 is an' arm 32, the outer end of which underlies the'bos's 17. Inan opening 33 in the outer end of the arm 32 a block 34 is secured as by a pin 35. 'Said block has an upper disk portion 36 having an opening 37 therein, and the block 34 has a socket 38 alined with the opening 37 Said opening is made of a size sufficient to pass a ball stud on the lower end of the spindle 19, while the socket 38 is adapted to neatly receive said stud. For retaining the stud in its socket,.a pair of balls operate in transverse openings 41 formedin the disk portion 36 of the block, in'bearing engagement with the upper surface of the stud by screws 42 provided with lock nuts 43. I

@Assuming the'parts to be in the position shown in Fig. 1, the operation is as follows: The article to be sheared is inserted into the proper openings 6, or is placed between the shear blades 12 and 13. The hand wheel 30 or lever 31 is then operated in the direction to turn the spindle 19 in the downward or pressure-applyingdirection. In this movement, the free end of the arm 32' travels in the arc of a circle, carrying with it the lower end of the'spindle. The swinging .movement thus imparted to the spindle is permitted by the pivotal mounting of the head 24 and thereby'of the tiibularmember 18 and bushing 20,in the tubular boss 17. After the plate or barhas been sheared, the actuating device'is operated" in the reverse direction until'the disk 3 has been' restored to normal position. Inthe rotation of the spindle, the series of balls 22 acts as a screw thread, causing longitudinal movement of the spindle. It has been found that the peculiar form otthe groove 20? enables the balls to travel up and down without binding, thus obviating the,

necessity of using a ball spacer.

While I have described the present em are provided. 'These'ball's being held bodiment of theinvention with considerable particularity, it will be understood that the invention is not limited'to the precise construction shown, and that certain features of the, invention are applicable to devicesfor punching metal sheets and bars. 8 i

I claim as my invention 1. In a device of the class members having a t each] other,iand balls engagingboth members to provide the equivalent of a screw threaded connection between them, one of said members havingfa'spiral groove receiving the balls in fitting engagement, the:substan tially circular cross section of the groove being relieved or cutaway adjacent the edges of the groove. 1

described, two

" '2. In a devlce of'theclassdes'eribed, acylescoping relation with 

